No true type export or quick test

Hey all,
I am currently working on a typeface and while i tried to do a quick test, the opentype PS is working flawlessly but the truetype is not giving me anything(the glyphs are not getting exported. It just shows me blanks and yeah the bitmap backgrounds are getting rendered). And while generating fonts nothing is happening when i am generating a truetype font but everything is fine if i am generating an opentype PS font. Any idea what ia happening. i am using FLS5 windows